CN110718853A - Integrated single laser source optical device for movable cold atom interferometer - Google Patents
Integrated single laser source optical device for movable cold atom interferometer Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
- H01S5/0657—Mode locking, i.e. generation of pulses at a frequency corresponding to a roundtrip in the cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
Abstract
The invention discloses an integrated single laser source optical device for a movable cold atom interferometer, which comprises: the laser source and power amplification module is used for generating single-frequency laser; the laser frequency stabilizing and adjusting module is used for converting the single-frequency laser into seven laser frequencies required by the cold atom interferometer; the laser power stabilizing, distributing and time sequence control module is used for generating various lasers with specific frequency and power according to time sequence; and the microwave source and electronic control module is used for controlling the on-off and time sequence of all the modules, and finally the output light is transmitted to the sensor head module of the atomic interferometer through four polarization-maintaining optical fibers. The invention has the advantages of small volume, low power consumption, low cost, high stability and the like.
Description
Technical Field
The invention mainly relates to the technical field of cold atom interference precision measurement, in particular to an integrated single laser source optical device for a movable cold atom interferometer.
Background
The cold atom interferometer is a new generation high-precision measuring instrument which takes atomic substance waves as a measuring medium instead of light waves. Because the cold atoms have the characteristics of short de Broglie wavelength, long free evolution time, large static mass, small atomic group velocity distribution, complex internal energy level structure and the like, the cold atom interference technology has many intrinsic superiority and good technical potential in precision measurement compared with the laser interference technology. According to the different interaction directions and modes of the laser and the atoms, the atomic interference gravimeter, the gravity gradiometer, the atomic interference gyroscope, the atomic clock and other precise measuring instruments can be formed and are used in the fields of inertial navigation, geophysical, geological exploration, resource exploration, industrial production, basic scientific research and the like.
In order to realize the cold atom interferometer, 7 lasers with different frequencies and different powers, such as reference light, cooling light, blown light, back pump light, probe light, Raman light 1, Raman light 2 and the like, are required to change according to specific time sequence at different time and interact with atoms, and the cold atom interferometer is used for finishing the functions of atom laser cooling and trapping, atom speed selection and atomic state preparation, atom beam splitting-reflecting-beam combining, atom population normalization detection and the like. In addition, in order to realize the mobile measurement, an integrated laser system with small volume, low power consumption, simple structure and good stability needs to be matched with the cold atom interferometer.
Laser systems based on discrete optical components built on optical platforms clearly do not meet the above requirements. The integrated optical device mainly has two realization modes of a free space type and an all-fiber type: integrated free space optics based on 5 (schmidt M, Prevedelli M, Giorgini a, tinogm, Peters a Applied Physics B2010, 102,11.) and 2 (Bodart Q, Merlet S, malssi N, Dos Santos FP, Bouyer P, landraging a Applied Physics Letters 2010,96, 134101; s.merlet, l.volodimer, m.lours, f.p.dos Santos, application.phys.b, 117, 749-. Although the mode of combining a plurality of semiconductor laser sources with an optical phase-locked loop can realize the required laser frequency and power, the device is still more complex, large in size, high in price and poor in stability; also achieved is a solution based on 2 (Zhang X, Zhang J, Tang B, Chen X, Zhu L, Huang P, Wang J, Zhang M Applied Optics 2018,57, 6545; O.Carraz, F.Lienhart, R.Charri re, M.Cadoret, N.Zahzam, Y.Bidel, A.Breson, applied.Phys.B, 97, 405-doped 411, 2009)) and 1 (Theron F, Carraz O, Renon G, Zahzam N, Bidel Y, Cadoret M, Breson A Applied Physics B2014, 118, 1; luo Q, Zhang H, Zhang K, DuanXC, Hu ZK, Chen LL, ZHou MK Rev Sci Instrum 2019,90,043104)1.5 μm optical fiber for communications band fiber laser sources. Although the development of a laser source with the diameter of 1.5 μm and an optical fiber device is mature, the application range of the optical fiber laser optical device with the frequency doubling mode of 1.5 μm is limited by a complex, low-efficiency, expensive and high-power consumption laser frequency doubling module, and the frequency doubling scheme is only applicable to rubidium, potassium and other atoms and cannot be applicable to other types of alkali metal atoms.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides an integrated single laser source optical device for a movable cold atom interferometer, which has small volume, low power consumption, low cost and high stability.
In order to solve the technical problems, the invention adopts the following technical scheme:
an integrated single laser source optical device for a movable cold atom interferometer, comprising:
the laser source and power amplification module is used for generating single-frequency laser;
the laser frequency stabilizing and adjusting module is used for converting single-frequency laser into seven laser frequencies required by the cold atom interferometer;
the laser power stabilizing, distributing and time sequence control module is used for generating various lasers with specific frequency and power according to time sequence;
and the microwave source and electronic control module is used for controlling the on-off and time sequence of all the modules, and finally the output light is transmitted to the sensor head module of the atomic interferometer through four polarization-maintaining optical fibers.
As a further improvement of the invention: the semiconductor laser LS in the laser source and power amplification module outputs single-frequency laser, the single-frequency laser is output through a laser isolator ISO1, the laser which is subjected to frequency stabilization and frequency shift is injected into a conical laser amplifier TA to be subjected to laser power amplification, and the laser is output through a laser isolator ISO 2.
As a further improvement of the invention: the semiconductor laser LS is a distributed feedback semiconductor laser, and the frequency shift amount and the frequency difference required by the atomic interferometer are realized by adopting a large-tuning-range high-precision laser frequency locking technology and a high-broadband laser phase modulator.
As a further improvement of the invention: the half-wave plate and the polarization beam splitter PBS1 in the laser frequency stabilizing and adjusting module divide the laser passing through the laser isolator ISO1 into 5:95, with a 5% fraction of the laser used for frequency stabilization and tuning.
As a further improvement of the invention: after the frequency of an electro-optical modulator EOM1 in the laser frequency stabilizing and adjusting module is shifted, the +1 st-order diffraction light is used as frequency-locked light, in an atomic cooling stage, the frequency of the electro-optical modulator EOM1 is shifted to 100MHz, and the polarization gradient cooling is realized by frequency sweeping, and in an atomic interference stage, the frequency of the electro-optical modulator EOM1 is shifted to 2 GHz; the +1 st order diffraction frequency locking light of the electro-optical modulator EOM1 is divided into two beams by a half-wave plate WP2 and a polarization beam splitter PBS2, wherein one beam is used as pumping light, is modulated by the electro-optical modulator EOM2, then acts on an alkali metal atom air chamber C after passing through the polarization beam splitter PBS3, the other beam is used as detection light, acts on the alkali metal atom air chamber C after passing through a beam expander prism L, then is detected by a photoelectric detector PD1 after passing through a polarization beam splitter PBS3 to form a modulation transfer spectrum signal, and the laser frequency is locked on a transition spectrum line of an alkali metal atom by a microwave source and an electronic control module; finally, the +1 st order diffracted light after passing through the electro-optical modulator EOM3 is used as back pump light, blown light F is 1 and Raman light 2, and the 0 th order light is used as cooling light, probe light, blown light and Raman light 1.
As a further improvement of the invention: the laser power stabilizing, distributing and time sequence control module comprises an acousto-optic modulator AOM1, a half-wave plate WP3, a polarization beam splitter PBS4, a photoelectric detector PD2, a proportional-integral feedback circuit PID, an acousto-optic modulator AOM2 and a mechanical switch, and couples laser into an optical fiber coupler according to a certain power ratio and transmits the laser to a sensor head module of the atomic interferometer through the half-wave plate WP4, the polarization beam splitter PBS5, the half-wave plate WP5, the polarization beam splitter PBS6, the half-wave plate WP6 and the polarization beam splitter PBS7 to realize the atomic interferometer.
As a further improvement of the invention: the microwave source and electronics control module controls the acousto-optic modulator AOM2 by controlling the acousto-optic modulator radio frequency source VCO3 through a laser time sequence; the microwave source and the electronic control module control the mechanical switch to perform time sequence control of each path of laser power through the mechanical switch time sequence controller SC of the laser device; the microwave source and the electronic control module are stabilized in power through a laser power stabilizing acousto-optic modulator radio frequency source VCO 2.
As a further improvement of the invention: all modules are mounted in one chassis.
Compared with the prior art, the invention has the advantages that:
1. the integrated single laser source optical device for the movable cold atom interferometer only comprises a single laser source and a single laser amplifier, and is simpler than any existing optical device for realizing atom interference, thereby simplifying the optical path structure and reducing the volume, power consumption and cost of the system.
2. The integrated single laser source optical device for the movable cold atom interferometer realizes the frequency shift amount and the frequency difference required by the atom interferometer by adopting a large-tuning-range high-precision laser frequency locking technology and a high-broadband laser phase modulator, and can realize mode-hopping-free frequency locking and frequency shifting within 2 GHz.
3. The integrated single laser source optical device for the movable cold atom interferometer does not comprise a frequency doubling device, so that the complexity of the optical device and a circuit system is reduced, and the single laser source optical device with small volume, low power consumption, low cost and high stability is provided for the movable cold atom interferometer.
4. The integrated single laser source optical device for the movable cold atom interferometer adopts a modular design, and all modules are connected through optical fibers, so that the adjustability and the stability of the optical device are improved.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the present invention.
FIG. 2 shows an embodiment of the present invention87Schematic experimental flow diagram of Rb atom interferometer.
FIG. 3 shows an embodiment of the present invention87Schematic of laser frequencies required for Rb atom interferometers.
FIG. 4 shows an embodiment of the present invention87Detailed optical path schematic diagram of integrated single laser source optical device of Rb atom interferometer.
Illustration of the drawings:
10. the laser source and the power amplification module; 11. a semiconductor laser LS; 12. laser isolator ISO1(ii) a 13. A tapered laser amplifier TA; 14. laser isolator ISO2；
20. A laser frequency stabilizing and adjusting module; 201. half-wave plate WP1(ii) a 202. Polarization Beam Splitter (PBS)1(ii) a 203. Electro-optical modulator EOM1(ii) a 204. Half-wave plate WP2(ii) a 205. Polarization Beam Splitter (PBS)2(ii) a 206. A beam expanding prism L; 207. an alkali metal atom gas cell C; 208. polarization Beam Splitter (PBS)3(ii) a 209. Photoelectric detector PD1(ii) a 210. Electro-optical modulator EOM2(ii) a 211. Electro-optical modulator EOM3；
30. The laser power stabilizing, distributing and time sequence control module; 301. acousto-optic modulator AOM1(ii) a 302. Half-wave plate WP3(ii) a 303. Polarization Beam Splitter (PBS)4(ii) a 304. Photoelectric detector PD2(ii) a 305. A proportional integral feedback circuit PID; 306. acousto-optic modulator AOM2(ii) a 307. Half-wave plate WP4(ii) a 308. Polarization Beam Splitter (PBS)5(ii) a 309. Mechanical switch S1(ii) a 310. Optical fiber coupler and single-mode polarization-maintaining optical fiber C1(ii) a 311. Half-wave plate WP5(ii) a 312. Polarization Beam Splitter (PBS)6(ii) a 313. Mechanical switch S2(ii) a 314. Optical fiber coupler and single-mode polarization-maintaining optical fiber C2(ii) a 315. Half-wave plate WP6(ii) a 316. Polarization Beam Splitter (PBS)7(ii) a 317. Mechanical switch S3(ii) a 318. Optical fiber coupler and single-mode polarization-maintaining optical fiber C3(ii) a 319. Mechanical switch S4(ii) a 320. Optical fiber coupler and single-mode polarization-maintaining optical fiber C4；
40. A miniaturized chassis;
50. a microwave source and an electronics control module; 51. semiconductor laser controller PID2(ii) a 52. Cooling and Raman light frequency hopping radio frequency source MW1(ii) a 53. Modulation transfer spectrum pumping optical modulation radio frequency source VCO1(ii) a 54. Raman light low noise radio frequency source MW2(ii) a 55. Laser cone amplifier controller PID3(ii) a 56. Laser power stable acousto-optic modulator radio frequency source VCO2(ii) a 57. Laser time sequence control acousto-optic modulator radio frequency source VCO3(ii) a 58. And a laser device mechanical switch time schedule controller SC.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1, the integrated single laser source optical device for a movable cold atom interferometer of the present invention comprises:
the laser source and power amplification module 10 is used for generating single-frequency laser;
a laser frequency stabilizing and adjusting module 20 for converting the single-frequency laser into seven laser frequencies required by the cold atom interferometer;
a laser power stabilization, distribution and timing control module 30 for generating various lasers with specific frequency and power according to a timing sequence;
and the microwave source and electronics control module 50 is used for controlling the on-off and the time sequence of all the modules, and finally, the output light is transmitted to the sensor head module of the atomic interferometer through four polarization-maintaining optical fibers.
In a specific application example, all the modules are installed in a case 40, and the case 40 is a miniaturized case.
As shown in fig. 2, to87For example, the experimental procedure of the Rb atom interferometer includes: the method comprises the following steps of cooling and trapping atoms by a magneto-optical trap, freely releasing radicals, selecting the speed and the state of the atoms, forming atom interference by the action of three beams of Raman pulses and the radicals, detecting the final state of an atom interference signal and the like, wherein the whole process is automatically controlled by a time sequence control system.
As shown in figure 3 of the drawings,87the lasers required for Rb atom interferometers include: reference light, cooling light, blown light, back pump light, probe light, raman light 1, raman light 2, and other 7 kinds of laser light with different frequencies. Wherein: passage of reference light87Frequency stabilization is carried out on Rb atom air chamber by modulation transfer spectroscopy to lock laser frequency87On the transition spectrum line of Rb atom F → F' ═ 3, obtain<The ultra-narrow laser line width of 100kHz is used for providing frequency reference for other lasers; the cooling light frequency and the F ═ 2 → F ═ 3 transition negative declination range is 8-140 MHz, and the cooling light frequency and the F ═ 3 transition negative declination range are used for forming a magneto-optical trap and optical viscose to cool and trap atomic groups; the detected light and the blown light F are in the same frequency as 2, and are in close resonance with the transition F2 → F' ═ 3Or the negative deflection is 1-2 MHz and is used for detecting or blowing away atoms on an F-2 state; the back-pumping optical frequency is close to resonance with the transition F ═ 2 → F' ═ 2, and is used for back-pumping the atoms in the F ═ 1 state to the F ═ 2 state; the blown light F-1 is in close resonance with the transition F-1 → F' -0 and is used for blowing away the atoms in the F-1 state; the Raman light 1 and 2 have the frequency difference of 6.834GHz and are negatively deviated from the transition F2 → F' 1 by several hundred MHz to several GHz, and are used for generating two-photon Raman transition to form an interference loop.
In a specific application embodiment, as shown in figure 4,87the detailed optical path of the integrated single laser source optical device of the Rb atom interferometer comprises:
the laser source and power amplification module 10 specifically includes: semiconductor laser LS 11 and laser isolator ISO 112. Conical laser amplifier TA13 and laser isolator ISO214；
The laser frequency stabilizing and adjusting module 20 specifically includes: half-wave plate WP1201. Polarization Beam Splitter (PBS)1202. Electro-optical modulator EOM 1203. Half-wave plate WP 2204. Polarization Beam Splitter (PBS)2205. Beam expanding prism L206, alkali metal atom gas chamber C207 and polarization beam splitter PBS 3208. Photoelectric detector PD 1209. Electro-optical modulator EOM2210. Electro-optical modulator EOM 3211；
The laser power stabilizing, distributing and timing control module 30 specifically includes: acousto-optic modulator AOM 1301. Half-wave plate WP 3302. Polarization Beam Splitter (PBS)4303. Photoelectric detector PD 2304. Proportional-integral feedback circuit PID 305 and acousto-optic modulator AOM 2306. Half-wave plate WP 4307. Polarization Beam Splitter (PBS)5308. Mechanical switch S 1309. Optical fiber coupler and single-mode polarization-maintaining optical fiber C 1310. Half-wave plate WP 5311. Polarization Beam Splitter (PBS)6312. Mechanical switch S 2313. Optical fiber coupler and single-mode polarization-maintaining optical fiber C 2314. Half-wave plate WP 6315. Polarization Beam Splitter (PBS)7316. Mechanical switch S 3317. Optical fiber coupler and single-mode polarization-maintaining optical fiber C 3318. Mechanical switch S 4319. Optical fiberCoupler and single-mode polarization-maintaining optical fiber C 4320；
The microwave source and electronics control module 50 specifically includes: semiconductor laser controller PID 251. Cooling and Raman light frequency hopping radio frequency source MW 152. Modulation transfer spectrum pumping optical modulation radio frequency source VCO 153. Raman light low noise radio frequency source MW 254. Laser cone amplifier controller PID 355. Laser power stable acousto-optic modulator radio frequency source VCO256. Laser time sequence control acousto-optic modulator radio frequency source VCO 357. The laser device mechanical switching timing controller SC 58.
In this embodiment, the specific laser transmission and control process is as follows:
the semiconductor laser LS 11 generates 780nm single-frequency laser which passes through a laser isolator ISO 112 post-processing half-wave plate 201 and polarization beam splitter PBS 1202 is divided into two parts of 5:95, 5% of laser is cooled and is connected with a Raman light frequency hopping radio frequency source MW 152 driven electro-optic modulator EOM1And the +1 st order diffracted light after the frequency shift of 203 is used as frequency-locked light.
In the atomic cooling phase, the electro-optical modulator EOM 1203 is shifted by 100MHz and can be swept to achieve polarization gradient cooling.
In the atomic interference phase, the electro-optic modulator EOM1203-2 GHz frequency shift; electro-optical modulator EOM1203 +1 order diffraction frequency locking light passes through a half-wave plate WP2204 and a polarizing beam splitter PBS2205 into two beams, one of which is used as pump light and is modulated by a modulated transfer spectrum pump light modulation radio frequency source VCO1531-20 MHz driven electro-optical modulator EOM2210 modulated and then passes through a polarization beam splitter prism PBS3After 208 on to alkali metals87On Rb atom air cell C207, the other beam is used as probe light, passes through beam expanding prism L206 and then acts on alkali metal87The Rb atom gas cell C207 is connected with a polarizing beam splitter PBS3208 is then detected by the photodetector PD1209 detecting to form a modulation transfer spectrum signal, and processing the signal by a semiconductor laser controller PID251 locking the laser frequency to the transition spectral line of F2 → F' 3; polarizing Beam Splitter (PBS)1202, and passing through a low-noise Raman light frequency source MW with the frequency of 6.834GHz254 driven electro-optic modulator EOM3The +1 st order diffracted light after 211 is used as back pump light, blown light F is 1 and Raman light 2, the 0 th order light is used as cooling light, probe light, blown light and Raman light 1, and the cooling and Raman light frequency hopping radio frequency source MW is adjusted1The driving frequency of 52 can accurately adjust the frequency deviation of each laser;
all the above lasers are first passed through a laser cone amplifier controller PID 355 controlled tapered laser amplifier TA13 and laser isolator ISO214, and then generates various required lasers by a laser power stabilization, distribution and timing control module 30, specifically by an AOM 1301. Half-wave plate WP 3302. Polarization Beam Splitter (PBS)4303. Photoelectric detector PD 2304. Proportional-integral feedback circuit PID 305 controls laser power stable acousto-optic modulator radio frequency source VCO256 power stabilization, and controlling the VCO of the radio frequency source of the acousto-optic modulator through the laser time sequence 357 control acousto-optic modulator AOM 2306 and a mechanical switch S controlled by a mechanical switch timing controller SC 58 of the laser device 1309. Mechanical switch S 2313. Mechanical switch S 3317 and a mechanical switch S 4319 sequential control of laser power, and final passing through half-wave plate WP 4307. Polarization Beam Splitter (PBS)5308. Half-wave plate WP 5311. Polarization Beam Splitter (PBS)6312. Half-wave plate WP 6315. Polarization Beam Splitter (PBS)7316 couples laser light into the fiber couplers 310, 314, 318, 320 and the single-mode polarization-maintaining fiber C at a certain power ratio1，C2、C3、C4And transmitting the data to a sensor head module of the atomic interferometer to realize the atomic interferometer.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (8)
1. An integrated single laser source optical device for a movable cold atom interferometer, comprising:
the laser source and power amplification module (10) is used for generating single-frequency laser;
the laser frequency stabilizing and adjusting module (20) is used for converting the single-frequency laser into seven laser frequencies required by the cold atom interferometer;
the laser power stabilizing, distributing and time sequence control module (30) is used for generating various lasers with specific frequency and power according to time sequence;
and the microwave source and electronic control module (50) is used for controlling the on-off and the time sequence of all the modules, and the final output light is transmitted to the sensor head module of the atomic interferometer through four polarization-maintaining optical fibers.
2. The integrated single laser source optical device for mobile cold atom interferometer according to claim 1, wherein the semiconductor laser LS (11) in the laser source and power amplification module (10) outputs single frequency laser light through laser isolator ISO1(12) Outputting, injecting the laser with stable frequency and frequency shift into a conical laser amplifier TA (13) for laser power amplification, and passing through a laser isolator ISO2(14) And outputting the data.
3. An integrated single laser source optical device for mobile cold atom interferometer according to claim 2, characterized in that said semiconductor laser LS (11) is a distributed feedback semiconductor laser, which implements the frequency shift and frequency difference required by the atom interferometer by using large tuning range high precision laser frequency locking technique and high broadband laser phase modulator.
4. An integrated single laser source optical device for mobile cold atom interferometers as claimed in claim 2 wherein the laser frequency stabilization and adjustment module(20) Half-wave plate (201) and Polarizing Beam Splitter (PBS)1(202) Will pass through laser isolator ISO1(12) The latter laser was split into two 5:95 parts, with 5% of the laser used for frequency stabilization and tuning.
5. Integrated single laser source optical device for mobile cold atom interferometers according to claim 3, characterized by the electro-optical modulator EOM in the laser frequency stabilization and adjustment module (20)1(203) After frequency shift, the +1 st order diffraction light is used as frequency locking light, and in the atomic cooling stage, the electro-optical modulator EOM1(203) Frequency shift to 100MHz and sweep frequency to realize polarization gradient cooling, and in the atomic interference stage, the electro-optical modulator EOM1(203) Shifting frequency to 2 GHz; electro-optical modulator EOM1(203) The +1 st order diffraction frequency locking light passes through a half-wave plate WP2(204) And Polarizing Beam Splitter (PBS)2(205) Is divided into two beams, one beam is used as pump light and EOM by an electro-optical modulator2(210) Modulated and then processed by a polarization beam splitter prism PBS3(208) Then acts on the alkali metal atom gas chamber C (207), the other beam is used as probe light, acts on the alkali metal atom gas chamber C (207) after passing through a beam expanding prism L (206), and then passes through a PBS (polarization beam splitter)3(208) Back-cover photoelectric detector PD1(209) Detecting to form a modulation transfer spectrum signal, and locking the laser frequency to a transfer spectrum line of an alkali metal atom through a microwave source and an electronics control module (50); finally EOM via electro-optical modulator3(211) The latter +1 st order diffracted light is used as the back pump light, the blow light F1, and the raman light 2, and the 0 th order light is used as the cooling light, the probe light, the blow light, and the raman light 1.
6. Integrated single laser source optical device for mobile cold atom interferometers according to any one of claims 1 to 5, wherein the laser power stabilization, distribution and timing control module (30) comprises an acousto-optic modulator AOM1(301) Half-wave plate WP3(302) Polarizing Beam Splitter (PBS)4(303) And a photoelectric detector PD2(304) Proportional-integral feedback circuit PID (305) and acousto-optic modulator AOM2(306) And a mechanical switch, wherein the mechanical switch is arranged on the casing,and through a half-wave plate WP4(307) Polarizing Beam Splitter (PBS)5(308) Half-wave plate WP5(311) Polarizing Beam Splitter (PBS)6(312) Half-wave plate WP6(315) Polarizing Beam Splitter (PBS)7(316) Laser is coupled into the optical fiber coupler and the single-mode polarization maintaining optical fiber at a certain power ratio and is transmitted to a sensor head module of the atomic interferometer to realize the atomic interferometer.
7. Integrated single laser source optical device for mobile cold atom interferometer according to any of claims 1-5, characterized in that said microwave source and electronics control module (50) controls the acousto-optic modulator radio frequency source VCO through laser timing3(57) Controlling acousto-optic modulators AOMs2(306) (ii) a The microwave source and electronic control module (50) controls the mechanical switch to carry out time sequence control of each path of laser power through a mechanical switch time sequence controller SC (58) of the laser device; the microwave source and electronics control module (50) stabilizes the radio frequency source VCO of the acousto-optic modulator through laser power2(56) Power stabilization is performed.
8. An integrated single laser source optics for mobile cold atom interferometers according to any one of claims 1 to 5 wherein all modules are mounted in one cabinet (40).
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| CN112366507A (en) * | 2020-11-11 | 2021-02-12 | 中国船舶重工集团公司第七0七研究所 | Atom cooling optical device based on all-solid-state continuous wave aureosapphire laser |
| CN112421371A (en) * | 2020-08-13 | 2021-02-26 | 中国人民解放军国防科技大学 | Cold atom interferometer single laser light source system |
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| CN112857409A (en) * | 2020-12-31 | 2021-05-28 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Automatic data acquisition and analysis system of cold atom interferometer |
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